page_title: List of Bulgarian inventors and discoverers
section_title: Aircraft
hierarchical_section_title: List of Bulgarian inventors and discoverers / Aircraft
caption_attribution_description: English: Photo of Assen Jordanoff in 1939
context_page_description: This is a List of Bulgarian inventors and discoverers, working locally or overseas. The list comprises people from Bulgaria and also people of predominantly Bulgarian heritage.
context_section_description: Assen Jordanoff - Jordaphone - the predecessor of the modern answering machine and tape recorder. Frozen Gasoline System for airplanes. Reverse Thrust device for jet engines.
  Simeon Petrov - Captain Simeon Petrov, Bulgarian Air Force, invented the world's first purpose-built air-to-surface bomb in 1912. The innovations included aerodynamically stabilized x-tail and an impact detonator. The majority of aircraft bombs to date follow Petrov's design. The Bulgarian Air Force deployed the original prototype, thus becoming the first military force in the world to conduct tactical airplane bombing in a full-scale war in 1912.
caption: Assen Jordanoff, inventor, engineer, and aviator-pioneer.
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